84 THE SKELETON OF THE CAT. 
facet is borne on a projection of the bone, the sustentaculum 
tali (c). Distad of the facets the surface is rough. The ventral 
surface is smooth. The proximal end (4) is grooved for the 
tendon of Achilles. The lateral surface is smooth and marked 
by a grooved tubercle, the peroneal tubercle (2), near the distal 
end. The medial surface is marked by part of the articular 
facet for the astragalus, and also by the grooved sustentaculum 
tali. The distal end (a) articulates with the cuboid. 
Cubord. Os cuboideum (Fig. 58, ¢).—The cuboid has 
somewhat the form of a cube and articulates by its proximal 
end with the calcaneus (a), and by its distal end with the fourth 
and fifth metatarsals. Its medial surface articulates with the 
scaphoid (@) and lateral cuneiform (¢). The ventral surface is 
marked near its distal end by an oblique ridge, distad of which 
is a deep groove, the peroneal groove (%), for the tendon of 
the peroneus longus muscle. 
Scaphoid. (Os naviculare pedis BNA) (Fig. 58, @).— 
The scaphoid is a boat-shaped bone. Its proximal surface is 
marked by a concave facet for the head of the astragalus (4), 
and its distal surface has three facets for the lateral (¢), ‘inter- 
mediate and medial (g) cuneiform bones. At the junction of 
the ventral with the medial surface is a prominent tubercle. 
The lateral surface bears two linear facets for articulation with 
the calcaneus (a) and cuboid (c). 
Lateral Cunetform. Ectocunetform. Os cunetforme ter- 
tium BNA (Fig. 58, ¢).—The lateral cuneiform is a wedge- 
shaped bone with a hooked process extending from the ventral 
sharp angle of the bone. It articulates by its proximal end 
with the scaphoid (¢@), and by its digtal end with the third 
metatarsal. The medial surface bears near its distal end two 
facets for the second metatarsal, and on its proximal end a 
facet for the intermediate cuneiform. The caudal surface has 
a facet on its proximal end for the cuboid (c). 
Intermediate Cuneiform.  Mesocunetform. Os cunetforme 
secundum BNA.—The intermediate cuneiform is small and 
wedge-shaped, with the base of the wedge dorsad. It lies 
between the lateral cuneiform and the medial cuneiform, articu- 
lates by its proximal end with the middle facet of the scaphoid, 
